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Oil Separation & Breather System

Oil Separation & Breather System

Every car has a crankcase vent system that is supposed to suppress oil from making it into the intake ports and combustion chamber. A good functioning system will separate oil from the atmosphere and return it to the oil pan (or collect it in a catch can) while allowing the leftover vapors to burn in the combustion chamber or recirculate through the system. This has always been known as a PCV system (Positive Crankcase Ventilation) but BMW has several other names for it - oil separator, crankcase vent (CCV), and cyclonic separator. Failures in the system will allow raw oil to enter the intake and eventually into the engine itself which can have disastrous effects on engine performance and longevity. As emissions regulations on oil and gas venting have gotten more stringent the PCV systems have gotten more complex and failure prone. And because the CCV is intertwined with other systems you could experience rough running, loss of power, higher oil consumption, misfiring, stalling, or other annoying issues. There is no replacement interval for these so we recommend inspecting your crankcase vent system as part of your regular maintenance routines. Symptoms of a bad crankcase vent are: whitish or yellowish film on the underside of the oil cap, whistling/squealing noises (not caused by a belt), suction on the oil cap that makes it hard to unscrew, large amounts of white smoke from the exhaust, and excessive oil consumption.

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CCV/PCV Breather Hoses (11)

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S55 Silicone Crankcase Vent Hose (11127850244)

10X Entries Into Our F80 M3 Sweepstakes

T#:57797979

Part#: 018465LA02

Ships on Feb 23, 2027

$ 99.99 USD

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$ 99.99 USD

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CCV Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:51391238

Part#: 11127850244

In Stock

Sale - Save 20% $ 99.99

This product was last offered at the strikethrough price on
05-03-2026

$ 79.99 USD

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$ 99.99

This product was last offered at the strikethrough price on
05-03-2026

$ 79.99 USD

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Performance Oil Separator Kit - M52/S52

10X Entries Into Our F80 M3 Sweepstakes

T#:51356040

Part#: 059015LA02KT2KT

In Stock

Sale - Save 19% $ 104.99

This product was last offered at the strikethrough price on
05-03-2026

$ 85.28 USD

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Sale - Save 19%

$ 104.99

This product was last offered at the strikethrough price on
05-03-2026

$ 85.28 USD

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On M52/S52-equipped BMWs, the factory crankcase ventilation (CCV) system is a notorious weak link. Between brittle plastic corrugated hoses that crumble from heat soak and an internal cyclone diaphragm prone to tearing, a failing CCV leads to massive oil consumption, vacuum leaks, and that dreaded "howling" whistle.

This kit addresses these issues with all new components and hardware. Both oil separator hoses, the cyclone separator itself, the mounting grommet, and the retaining bolts are included. Servicing this system is guaranteed to restore performance lost as a result of worn CCV components.

Kit includes:

Cyclone Separator/Crankcase Pressure Regulator Valve High Performance Silicone Breather Hose Return Hose Mounting Grommet Hex Bolt (3)

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Oil Separator kit - N63

10X Entries Into Our F80 M3 Sweepstakes

T#:56291074

Part#: 11158636540KT2

Ships in 4 Business Days

$ 429.67 USD

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$ 429.67 USD

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If your BMW is burning oil, showing unmetered air faults, or suffering from degraded throttle response, a compromised breather system is usually the culprit. The N63 Crankcase Breather Package pairs Genuine BMW oil separators with OE tier Rein connecting pipes. Designed to restore factory level oil separation and sealed vacuum integrity across both cylinder banks

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Vacuum Pipe

10X Entries Into Our F80 M3 Sweepstakes

T#:52586629

Part#: 11157603816

In Stock

Sale - Save 20% $ 29.99

This product was last offered at the strikethrough price on
05-03-2026

$ 23.99 USD

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Sale - Save 20%

$ 29.99

This product was last offered at the strikethrough price on
05-03-2026

$ 23.99 USD

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URO Crankcase Vent Valve Repair Kit - B58

2X Entries Into Our F80 M3 Sweepstakes

T#:55713528

Part#: 11121025447

In Stock

Sale - Save 9% $ 222.99

This product was last offered at the strikethrough price on
07-08-2026

$ 203.49 USD

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Sale - Save 9%

$ 222.99

This product was last offered at the strikethrough price on
07-08-2026

$ 203.49 USD

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The URO Parts Crankcase Vent Valve Repair Kit is the smart technician's fix for the notorious BMW crankcase ventilation failures.

Crankcase Vent Hose / PCV Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:56977971

Part#: 11127588417

Ships in 2 Business Days

$ 42.99 USD

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$ 42.99 USD

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This URO Parts crankcase ventilation line offers a durable, budget-friendly replacement for failing factory tubing.

Crankcase Ventilation Refresh Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:57543744

Part#: 11158647962KT2

In Stock

$ 265.99

This product was last offered at the strikethrough price on
09-29-2026

$ 264.99 USD

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$ 264.99 USD

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Maintain optimal engine vacuum and prevent oil blow-by failures under hard driving with this complete Crankcase Ventilation Refresh Kit. Aged oil separator valves and heat stressed plastic hoses fail unexpectedly, leading to oil ingestion, loss of power, and damaged rear main or valve cover gaskets from excessive crankcase pressure buildup. Designed as a direct fit refresh, this kit ensures crisp throttle response, proper engine breathing, and total peace of mind on the street or track.

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Oil Separator Vent Hose

T#:57725199

Part#: 11617522933

Ships in 9 Business Days

$ 20.99 USD

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$ 20.99 USD

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The Burgaflex Oil Separator Vent Hose is built to high engineering standards to withstand the harsh thermal environments of a hard-driven engine bay.

Rein Pressure Regulator Valve Repair Kit - E53, E60, E63, E64, E65, E...

2X Entries Into Our F80 M3 Sweepstakes

T#:55821694

Part#: 11127547058

Ships in 4 Business Days

$ 16.99 USD

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$ 16.99 USD

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This Rein Automotive repair kit allows you to service the internal components of the crankcase breather valve independently. Instead of replacing the entire, costly valve cover or manifold assembly, this kit provides the exact wear items required to rebuild the factory housing back to original operating specifications. All components are manufactured to strict OE tolerances. The diaphragm is molded from premium, oil-resistant elastomers engineered to withstand prolonged exposure to aggressive synthetic lubricants, fuel vapors, and extreme under-hood heat cycles without losing its elasticity or sealing profile.

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Vent Hose - Crankcase-Ventilation / Oil Separator

T#:57725180

Part#: 11151740393

Ships in 3 Business Days

$ 5.99 USD

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$ 5.99 USD

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Maintain your engine's operational integrity and keep vacuum leaks at bay with this essential replacement vent hose from Burgaflex.

Crankcase Ventilation Connecting Pipe - Cylinders 1-4

T#:57725182

Part#: 11157646086

Ships in 3 Business Days

$ 76.99 USD

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$ 76.99 USD

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Keep your performance engine running cleanly and efficiently with the Burgaflex Crankcase Ventilation Connecting Pipe for Cylinders 1-4.

Engine Breather Hose

T#:57725177

Part#: 11157522931

Ships in 3 Business Days

$ 52.99 USD

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$ 52.99 USD

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Maintain peak engine health and keep your crankcase ventilation system operating seamlessly with this high-grade engine breather hose from Burgaflex.

Oil Separator Vent Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:53326231

Part#: 11617522933

In Stock

Sale - Save 15% $ 23.99

This product was last offered at the strikethrough price on
09-16-2026

$ 20.39 USD

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Sale - Save 15%

$ 23.99

This product was last offered at the strikethrough price on
09-16-2026

$ 20.39 USD

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E70 Return Pipe

10X Entries Into Our F80 M3 Sweepstakes

T#:52551447

Part#: 11537806706

In Stock

Sale - Save 20% $ 129.99

This product was last offered at the strikethrough price on
05-03-2026

$ 103.99 USD

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$ 129.99

This product was last offered at the strikethrough price on
05-03-2026

$ 103.99 USD

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Crank Case Ventilation Valve - Priced Each

10X Entries Into Our F80 M3 Sweepstakes

T#:53326230

Part#: 11158647299

In Stock

Sale - Save 20% $ 80.99

This product was last offered at the strikethrough price on
05-03-2026

$ 64.79 USD

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Sale - Save 20%

$ 80.99

This product was last offered at the strikethrough price on
05-03-2026

$ 64.79 USD

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Crank Case Vent Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:58234541

Part#: 11157843151

Ships on Mar 16, 2027

$ 33.99 USD

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$ 33.99 USD

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Oil Separation & Breather System
- CCV/PCV Breather Hoses (11)

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